Dumb-waiter.



T. BARTLETT.

DUMB WMTEB. AFPLICM'IOII FILED bun 1. ms.

1,326,433. Patented Dec. 30,1919.

2 SHEETS-SHEET I.

. 'W TNESSES INVENTOR i A TTORIIE Y8 I. BARTLETT;

DUMB WAITEB.

APPLlCATION HLED mun. m9.

Patented Dec. 30, 1919.

2 SHEETS-SHEET 2- [Zeadarefiariliifi MENTOR:

I TTOHNEI'S V wnmsssrs THEODORE BARTLETT, OF ENDERLIN, NORTH DAKOTA.

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Specification of Letters Patent.

Patented Dec. 30, 1919.

Application filed July 7, 1919. Serial No. 309,029.

To all whom it may concern.-

Be it known that I, THEODORE Bannnrr, a citizen of the United States, residing at Enderlin, in the county of Ransom and State of North Dakota, have invented new and useful Improvements in Dumb-Wa1ters, of which the following is a specification.

This invention relates to hoisting devices, particularly to dumb waiters, and hasfor its object the rovision of a dumb waiter of extremely simple construction in which the minimum number of guide pulleys is employed which are so arranged and related that a direct ull may be exerted upon the operating cablb threaded thereabout.

An important object is the provision of a dumb waiter of this character in which the movable carriage is provided with means whereby it may be quickly and easily disengaged from the guides whereby to permit its removal for cleaning, repairing, or for any other desired purpose.

Another object is the provision of a dumb waiter equipped with locking means having connected therewith a trip rope which extends throughout the length of the device whereby the locking mechanism may be operated from any floor to hold the movable carriage in locked position at any desired location.

Another object is the rovision of a dumb waiter in which one o the guide pulleys is adjustably mounted within its bracket whereby adJustment may be made for regulating the tension u on the operating cable.

Another object is t e provision of a dumb waiter structure in which the rear wall of the casing is provided with a door whereby access may be had to the interior of the casing for adjusting the counterbalancing weights which are connected with the mov able member.

With the above and other objects and advantages in view the invention consists in the details of construction to be hereinafter more fully described and claimed, and illustrated in the accompanying drawings, in which- Figure 1 is a longitudinal sectional view through my device, looking at the front thereof,

Fig. 2 is a longitudinal sectional view taken at right angles to Fig. 1,

Fig. 3 is a plan view showing the relative position of the pulleys at the top of the casing, and

Fig. 4 is a detail view of the locking mechanism.

Referring more particularly to the drawings, the numeral '10 designates the casing of the device, which includes front, back, and side walls 11, 12 and 13, respectively. At its upper end the casing 10 has secured therein a transverse board 14 forming a supporting platform upon which are mounted brackets 15 and 16 within which are journaled pulleys 17 and 18, respectively. The lower end of the casing is closed by a board 19 which forms a supporting platform for a bracket 20 within which is journaled a pulley 21 which has its axle 22 passing through elongated slots 23 formed in the bracket. Secured within the casing 10 at some distance above the bottom wall 19 is a, transverse board 24 supported by suitable brackets 25 and rovided centrally with an opienmg 26 and a so provided with a hole 27. T e top platform member 14 is provided with a central opening 28 and also with holes 29 and 30.

The movable member is designated broadly by the numeral 31 and comprises a rectan ular'casing of a size to fit within the casing 10 and having its front open. Any suitable number'of shelves 32 may be rovided within this movable member. e member 31 is of course slidable within the casing 10 and is guided in its movement by a plurality of tapered pins 33 which extend through the sides of the carria e and which engage behind longitudinal ri s 34 on the side walls 13 of the casing 10. Secured upon the top of the carriage is a bail member 35 upon which is engaged a hook 36 carried by one end of a cable 37 which extends through the central opening 28 in the to member 14, which is trained about the pu ley 17 which extends through the holes 30 and 27 in the members 14 and 24, which is trained about the pulley, 21, which then extends upwardly through the central opening 26 in the member 24, and which has its other end connected with a bail member 38 secured upon the bottom of the movable member 31. It will be seen that by grasping the cable 37 and pulling upon it in either direction, the movable member 31 will be moved vertically within the casing 10.

In order that the weight of the movable carriage and its contents may be counterbalanced, I provide a cable 39 which carries at one end a hook 40 detachably engageable with the bail 35. This cable 39 extends through the central opening 28 in the member 14, is trained about the pulley 18 and carries at its other end a hook 40 upon which is engaged an adjustable counter weight 41, it being possible to add more weights when necessary. In order that access may be had to the casing 10 for per nittin adjustment of the weight 41, or rather addition of more weights, I provide a hinged door 42 in the back wall 12 of the casin It is of course understood that the front wa l of the casing is provided at each floor with an opening 43 which may remain open or which may be provided with a door if desired.

In order that the movable carriage may be held at any desired height, I provide a locking mechanism which comprises a ratchet 4% secured upon the end 45 of the axle of the pulley 18, this axle projecting beyond one side of the bracket 16 and this ratchet is engaged by a pawl 4E6 pivoted upon a stud 4T projecting from the bracket. Oomiected with the pawl is a trip rope 48 which extends through a suitable guide 49 at one side wall of the casing and which hangs down within the casing 10 and substantially throughout the length thereof. It will be seen that when the operator grasps the trip rope 48 and pulls upon itthe pawl 46 will be held out of engagement with the ratchet 44 and the movable carria e may be moved up or down within the casing 10 by pulling upon the cable 37. When 1t is desired to lock the movable carriage at any desired point, it is merely necessary that the operator release the trip rope 48 whereupon "the pawl 46 will gravitationally engage the ratchet -14 and hold the pulley 18 and consequently the movable carriage against movement.

The provision of the adjustable pulley 21 is consldered important as the cable 37 may be properly tightened b adjusting the pulley 21 within the brac et 20, the slots 23 permitting this regulation.

From the foregoing description and a study of the drawings it will be apparent that I have thus provided an extremely simple and inexpensive dumb waiter structure, the parts of which are so arranged that a direct pull ma be applied to the movable carriage for e ectiug elevation or lowering thereof, in which means is provided for giving access to the counter-balancing weights so that the weights may be varied when necessary, and in which the movable carriage may be quickly and easily removed from its guide casing merely by the removal of tvvo of the tapered pins at either side thereof.

While I have shown and described the preferred embodiment of my invention it is of course to be understood that I reserve the right to make such changes in the form, construction, and arrangement of parts as will not depart from the spirit of the invention or the scope of the subjoined claim.

Having thus described my invention, I

claim A dumb waiter structure comprising a rectangular casing forming a gnideway, the side walls of the casing being provided with longitudinally extending ribs, a movable member slidab-ly mounted for vertical movement within sald casing, means for moving said member, and a pluralityof tapered pins driven outwardly through and extending beyond the sides of said movable member and engaging behind said ribs, said pins being removable whereby to permit bodily Wall of said movable member from the guide casing.

THEODORE BARTLETT. 

